Those are not primary offenses and an officer can't stop someone just for those items alone.

Aside from the window tint, the other items are what officers write instead of giving you a point violation summons like speeding.

The obstructed license plate has recent case law that pretty much allows it because a Judge decided to legislate from the bench. This is why officers do not write a summons under this item anymore. You're more likely to get a summons for obstructed windshield or delaying traffic as an alternative to a moving violation like speeding.